Abstract
Short fluorescence lifetime is the main problem encountered in designing an efficient Pr3+-doped amplifier at 1.3 μm. Lifetimes observed in low phonon energy glasses are far shorter than those indicated by calculations. We examine 1.3 μm fluorescence quenching in Pr3+-doped glasses via concentration and impurity quenching in order to estimate the limits on metastable lifetimes achievable in low-doped, low-impurity glasses. The optimum doping level and the requirements for impurity content are assessed. Three glass hosts are studied in detail; cadmium-halide, gallium-indium-fluoride, and germanium-gallium-sulphide. The prospects for extending the Pr3+ metastable lifetime in these glasses are considered.
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